Signature on Checks using SAP script

Just want to seek your help regarding the signature on check. The printer they used is the resident printer (MICR Printer). We need to put the new signature on the check replacing the old one. But the problem is the new signature didn't appear. We already used the tcode SPAD and added the new sequence on the print control.

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Anna,
It looks like no one has yet responded to your query, so I'll engage and see if I can help. I take it you have already uploaded the graphic for the new signature to your SAP system, yes? Is this problem occurring on your development system or your QA system? If it's in the QA system, have you transported the new graphic to that system? If it's in development, have you activated the SAPscript changes in your unit test client (if testing in a different client from where you made the changes)?
Cheers,
Terry